Ranjan Kumar Gupta
Contact
Information
301 University AVE SE, Apt# 204
Minneapolis MN 55414
Mobile: (612) 226-8847
E-mail: guptar@ge.com
Present
Status
High Power Electronics Engineer
Electronic Power Conversion, GE Global Research Center, Niskayuna, NY
Education
Ph.D. Electrical Engineering, GPA: 3.93/4.00
June 2010
University of Minnesota, Twin Cities, Minneapolis
• Thesis: Matrix converter based open-end winding ac machine drives with enhanced capabilities
• Advisor: Prof. Ned Mohan
• Focus on common-mode voltage elimination, bearing currents and high-frequency isolated converter topologies for three-phase motor drives application
July 2010 onwards
M.S. Electrical Engineering, GPA: 4.00/4.00
February 2007
University of Minnesota, Twin Cities, Minneapolis
• Thesis: A Three-Phase Permanent Magnet Brushless DC Motor for Low-Power, Low-Speed Fan
Applications–Optimizing Cost and Efficiency
• Advisor: Prof. Ned Mohan
• Focus on finite-element (FE) analysis, design and fabrication of PMAC motor for low cost and
high efficiency
B.Tech. Electrical Engineering (4yr degree), GPA: 9.07/10
July 2004
Indian Institute of Technology (IIT) Roorkee, India
• Thesis: Design and fabrication of three-phase Unified Power Quality Conditioner (UPQC)
• Focus on theoretical study and simulation of active series and shunt filters for harmonic compensation
• GPA: 10/10 (final semester), Overall Department Rank: 02/64
Research
Research Assistant, University of Minnesota, Twin Cities
Sept 2005 to present
Experience in
Academia
PhD Thesis work :
• Researching on novel, matrix-converter based drives (direct and two-stage) for open-end winding
ac machine with enhanced capabilities. Proposed a PWM strategy for common-mode free voltage (instantaneous) at the machine terminals, and a control strategy to enhance reactive power
support to the grid. Special focus on the modulation strategies to increase the output voltage
transfer ratio of the matrix converter and to eliminate the bearing currents.
• Designed, fabricated and tested an Integrated-Matrix-Converter-System. This is a generalized 5
kW direct ac-ac converter system which contains a matrix of 54 IGBTs. This hardware setup
is reconfigurable. It is presently being used to perform experiments on novel high-performance
matrix converter based drives for open-end winding ac machine. This hardware setup was also
used to perform experiments on conventional three-phase matrix converter drives.
• Designed and fabricated the gate drive boards for IGBT modules and the control interface card.
The control interface is built using a ds1103 dSPACE system which is interfaced with a Xilinx
Spartan-3 FPGA board to generate gate signals for IGBTs.
Other Projects:
• Proposed a novel three-phase, high-frequency isolated power electronic converter topology. This
converter system uses only two controlled switches to create a three-phase high-frequency ac link.
The University of Minnesota has filed a US patent application.
• Worked with fellow PhD students on simulation and design of a direct-link drive for open-end
winding ac machine (no dc-link) and high-frequency isolated power converters.
• Developed experiments for electric drives laboratory for undergraduate education and dissemination purpose. Experiments such as closed loop speed control of dc motor, v/f control of induction
motor, vector control of PMAC motor were designed.
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• Developed a synthesizable VHDL code of a microcontroller similar to Microchip PIC12F509.
• Analyzed different current control strategies for single-phase CCM boost PFC and proposed a
unified method to derive small-signal models and CCM boundary conditions.
MS Thesis:
• Designed (finite-element analysis) and built an experimental prototype of a three-phase 20 W, 200
rpm PMBLDC motor. Various rare and non rare earth magnets were used in the design process
to optimize the cost and performance.
• Fabricated and tested the PMBLDC motor drive system using a back-to-back converter.
• Proposed a novel design optimization using halbach-magnetization to further increase the efficiency.
Other tasks:
Actively involved in the following activities with my advisor:
• Grant-Proposal writing in the related research area to the funding agencies NSF, ONR and IREE.
• Presentation of ongoing research in our group at the University of Minnesota in professional
meetings and international workshops.
• Annual reports and presentations to the supporting agency of my PhD project.
Undergraduate Research Fellow, IIT Roorkee
January 2002 to May 2004
• Project title: Modeling, Simulation and fabrication of a three-phase Unified Power Quality Conditioner (UPQC).
• Developed a software to simulate single-phase line-commutated thyristor converter in Visual C++.
Young Engineer Fellow, Indian Institute of Science Bangalore
May 2002 to July 2002
• Project Title: Design of a 12V DC, 60W axial flux Switched Reluctance Motor for bicycle drive
application.
Industry
Graduate Intern, GE Global Research, Niskayuna, NY
May 2008 to August 2008
projects,
• Investigated Medium Voltage (MV) IGBT gate drivers for future GE wind power converters.
full-time and
System level and circuit-level analysis were performed.
internships
• Evaluated and analyzed the semiconductor losses for various future options (power electronic
topologies) for XGD 600A - a gradient coil driver used in MRI.
Graduate Intern, Electric Machinery, Minneapolis, MN
July 2006 to August 2006
• Designed a RC Snubber for a 5000A brushless exciter. A diode model was built using the datasheet of the device used in the exciter. The model was then used in a simplified circuit model of
the converter (to reduce the convergence problem in PSPICE simulation) to design the snubber
circuit parameter.
• Verified the design of a 100 HP multi-tooth (12/28) switched reluctance motor with finite-element
transient simulation. The electrical losses calculated from finite-element simulation were compared
with the existing experimental results.
Full-time Executive Engineer, Trident Group, India
July 2004 to July 2005
• Led the Energy Conservation Cell to optimize the energy consumption of the terry towel plant.
Power factor correction devices were relocated in the whole plant; reduction in loading (by more
than 15%) of power cable was achieved along with reduction in line losses.
• In the technical team of Erection and Commissioning of Electrical Machines and Power Substation
in the new terry towel plant. My duty was to learn thoroughly the installed machines, handle
breakdown of machines and train the technicians.
Skills
Matlab, Simulink, Saber, PCAD - PCB design, Verilog, Modelsim, Finite Element Analysis Software:
FLUX 3D, GEMINI (2D), Magneflux BLDC (2D).
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Publications
Summary of Publications:
Patent - 1, Journal paper - 2, Conference papers - 14
Under review: Journal paper - 1, Conference paper - 1
Patent(application pending):
• Ranjan K. Gupta, K. K. Mohapatra and Ned Mohan “THREE-PHASE, SWITCHED MULTIWINDING POWER ELECTRONIC TRANSFORMERS”, U.S. Provisional Patent Application
Serial No.: 61/224,790, July 2009 .
Journal and Conference Publications:
• Ranjan K. Gupta, K. K. Mohapatra, Apurva Somani and Ned Mohan,“Direct matrix converter based open-end-winding ac machine drive with advance feature” accepted for publication
in IEEE Transactions on Industrial Electronics, 2010.
• K. K. Mohapatra, Ranjan K. Gupta, Satish Thuta, Apurva Somani, Amod Umarikar,
Kaushik Basu and Ned Mohan “New Research on AC-AC Converters without Intermediate
Storage and Their Applications in Power-Electronic Transformers and AC Drives”, Invited paper, IEEJ Transactions on Electrical and Electronic Engineering, vol. 4, no. 5, pp. 591-601,
2009.
• Ranjan K. Gupta, K. K. Mohapatra and Ned Mohan, “Enhancement in Power Control Range
of Matrix-Converter-Based Wind Turbines without Common-Mode Voltage at the Machine
Terminals” - under review, IEEE Transactions on Industrial Electronics.
• Ranjan K. Gupta, Apurva Somani, K. K. Mohapatra and Ned Mohan “Space vector PWM
strategy for a direct matrix converter based open-end winding ac drive with enhanced capabilities”, IEEE APEC conference, Palm Spring, CA, 2010.
• Ranjan K. Gupta, K. K. Mohapatra and Ned Mohan “Open-End Winding AC Drives with
Enhanced Reactive Power Support to the Grid While Eliminating Switching Common-Mode
Voltage,” IECON 2009,35th Annual Conference of the IEEE Industrial Electronics Society,
Nov. 2009, Portugal.
• Ranjan K. Gupta, K. K. Mohapatra and Ned Mohan “A novel three-phase, switched multiwinding power electronic transformer”, IEEE Energy Conversion Congress and Exposition
(ECCE), ECCE 2009, San Jose, California.
• Ranjan K. Gupta, Gysler F, Castellino, K. K. Mohapatra and Ned Mohan “A Novel Integrated Three-Phase, Switched Multi-Winding Power Electronic Transformer Converter for
Wind Generation System,” IECON 2009, 35th Annual Conference of the IEEE Industrial Electronics society, Nov. 2009, Portugal.
• Somani, A.; Ranjan K. Gupta, Mohapatra, K.K.; Basu K.; Mohan, N., “Modulation Strategies for Direct-Link Drive for Open-End Winding AC Machines”, International Electric Machines and Drives Conference, IEEE, 3-6 May 2009.
• Apurva Somani, Ranjan K. Gupta, K. K. Mohapatra and Ned Mohan “A minimum-switch
direct-link drive with common-mode voltage suppression and active filtering for open-end winding AC machines” IEEE, Power Electronics Specialists Conference (PESC), 2008, pp. 2889-2893
Greece.
• Ranjan K. Gupta, K. K. Mohapatra and Ned Mohan, “Novel topologies for reduced switchcount power electronics transformers”, Proceeding of GCMS 2009, Istanbul, Turkey.
• Apurva Somani, Ranjan K. Gupta, K. K. Mohapatra and Ned Mohan “A PEBB-based directlink drive for open-ended AC machine”, Proceedings of the 2007 summer computer simulation
conference (SCSC), pp. 118-123, San Diego, California.
• K. Basu, Ranjan K. Gupta, S. Nath, G. Castelino, K. Mohapatra, and N. Mohan, “Research in matrix-converter based three-phase power-electronic transformers”, in Accepted for
publication in IEEE IPEC-Sapporo, 2010.
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• Eric Lieder, Ranjan K. Gupta and Ned Mohan “A Low-Cost FPGA Based Controller for
Electric-Drives Laboratory and Dissemination Purposes” accepted for presentation in 2007
ASEE North Midwest Section Conference Educating Engineers for a Sustainable Future, Michigan Technological University Houghton, Michigan.
• Ranjan K. Gupta and Ned Mohan “A Three-Phase Permanent Magnet Brushless DC Motor
for Low-Power Low-Speed Fan Applications - Optimizing Cost and Efficiency”,IEEE Industry
Applications Conference, 2007, 42nd IAS Annual Meeting , pp. 846-852, New Orleans.
• Ranjan K. Gupta, Hariharan Krishnaswami and Ned Mohan “A Unified Analysis of CCM
Boost PFC for Various Current Control Strategies”, IEEE International Conference on Power
Electronics, Drives and Energy Systems, PEDES 2006, New Delhi, India.
• Jalpa Shah, Ranjan K. Gupta, Krushna K. Mohapatra and Ned Mohan “Power Management
with a Dynamic Power Limit by a Power Electronic Transformer for Micro-Grid”, accepted for
publication in the proceedings of IEEE PES meeting, 2010, Minneapolis.
• A. Somani, Ranjan K. Gupta, K. K. Mohapatra and Ned Mohan “Circulating Currents in
Open-End Winding PWM AC Drives” - under review, IEEE IECON conference 2010, AZ.
• Gysler Castelino, Kaushik Basu, Ranjan K. Gupta, Ned Mohan “Power Electronic Transformer with Reduced Number of Switches: Analysis of Input Clamp Circuit and a Modulation
Strategy to Eliminate Input Snubber Requirement” - accepted for publication in IEEE IECON
2010.
Awards and
Honors
Other
informations
• Student scholarship recipient for the conference IECON 2009, awarded by Industrial Electronics
Society of the IEEE.
• A letter of appreciation for excellence from the CEO of Trident group, India.
• Awarded with Industrial Scholarship from TATA STEEL and full scholarship from IIT Roorkee
for undergraduate education.
• Session Head (Electrical Engineering) of IEEE student branch IIT Roorkee.
• Selected in Young Engineer Fellowship Program (YEFP) 2003 for summer internship at the Indian
Institute of Science Bangalore among 34 students selected all over the country.
• Status: F1 Student VISA, OPT
• References: Available upon request
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